Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

This M42 features the three-prong flash supressors on the 40mm guns, although they lack the reinforcing ring that was introduced late in the production run. The lineage of the 76mm gun tank M41 is obvious when looking at the lower hull and running gear. The stowage boxes over the fender were for 40mm ammunition, and two spare 40mm barrels were able to be stored under the left-side ammunition stowage boxes. One of the main engine air cleaners is mounted just behind the fender stowage box, and one of the main engine mufflers is at the rear of the fender.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

This detail of the turret front provides a better view of the three-prong flash suppressors that replaced the earlier conical flash hiders. The mount for the .30cal machine gun can be seen on the turret to the left of the picture, and peeking out from behind the gun shield to the right of the picture is the mount for the gunner's left-hand ring sight.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

This side of the turret was home to the mount for the .30cal machine gun. The open-topped turret has been covered by now-rusty plate.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

"Bam Bam's" front door is immediately obvious, with the hinge, spring, and hold-open latch on the right of the picture. The headlight mountings and guards are just outboard on both sides of the front door, and the driver's and commander's periscope guards are visible on top of their hatches.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

This shot shows where two spare 40mm barrels were stowed under the fender stowage box. The fender itself is angled to a point like those on later-production M41 Walker Bulldogs.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

The vehicle commander occupied the seat in the hull front right, and the driver sat beside him. On early vehicles, the hull roof between the driver's and commander's hatches opened to the front and rear. This later-production vehicle does not feature these hull roof doors.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

Stowage boxes line the vehicle's right fender. Details of the suspension, including the volute spring bumper stops, can be seen at the bottom of the picture. The rear turret machine gun mount can also be seen at the very top of the photo.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

This rear view shows the other main engine air cleaner. The right-side main engine muffler is just behind the air cleaner, and a better view is available of the rear machine gun mount and turret ammunition stowage boxes. A tool rack was normally placed on top of the right main engine muffler, but it is missing from this vehicle.

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Twin 40mm Self-propelled Gun M42 in Easton, Pennsylvania.

The shroud sitting just inboard of the main engine air cleaner was the exhaust port for the auxiliary engine. The pipe coming from the port indicates that this vehicle was equipped with a muffler for the auxiliary engine, but it has disappeared along with the tool rack on which it was mounted.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The rear deck is better illustrated in this image. The air cleaners are behind the fender stowage boxes, and the engine compartment grille in the center of the rear deck is flanked to either side by two engine compartment grille doors. The plates in the center of the vehicle behind the engine grilles are the front and rear transmission access doors. These are flanked by the right and left battery access doors. The cover on the rear transmission access door is for the transmission oil filler, while the one on the front transmission access door is for engine oil. The gunner's ring sight can be seen mounted to the turret to the gun shield's left.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

This vehicle has spare barrels stowed on the fender.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The extra barrels were stowed with their rear to the front of the vehicle. The recuperator springs can be seen around the end of the barrels.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The mounting mechanism for the spare barrels is detailed in this image.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

Peering through the open front door, we are able to see the positions for the driver and commander. The turret mechanics can be seen towards the center of the vechicle, and a heater duct snakes along the floor between the driver and commander.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The driver's position is detailed here. His steering control crossbar is placed directly in front of his seat, and his legs would reach around the vertical post to the foot pedals. The white transmission range selector control lever is placed in front of and to the right of the driver, and the black handle to the rear of the transmission range selector is the primer pump.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The large perforated pedal is the accelerator, while the smaller pedal to its left is the brake. A cover for the front set of torsion bars can be seen running crosswise along the floor, and the mounting point for the idler wheel can be discerned on the hull side.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The transmission range selector is detailed here. There are selections for reverse, low, high, neutral steer, and neutral park. Note the return springs attached to the brake pedal and the transmission range selector lever.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The commander's position is shown here. Radio racks are provided to his right.

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

The inside of the front door is illustrated here. Flashlight and periscope head stowage is labeled, and two interior locking handles are on the far end of the door.

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Twin 40mm Self-propelled Gun M42 at the Illinois State Military Museum.

The turret is reversed on this vehicle. It is a late-production machine equipped with features like the auxiliary engine muffler on the tool rack above the right main engine muffler and reinforcing rings around the flash suppressors. The auxiliary engine muffler is one of the second type fitted; earlier mufflers were smaller and did not extend the entire length of the tool rack. (Picture courtesy Kristopher Barrington.)

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Twin 40mm Self-propelled Gun M42 at the Virginia Museum of Military Vehicles.

A closer shot of the mounting of the auxiliary engine muffler and tool rack is provided here.

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Twin 40mm Self-propelled Gun M42 at the US Army Heritage and Education Center at Carlisle Barracks.

A closer view of the flash suppressors with reinforcing rings is provided here.

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Last updated 3 Oct 2016.
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© Copyright 2001-16 Chris Conners